Bell & Gossett HS 504F Series 1141 Temperature Regulators - Manual (Page 3)

THERMOSTATIC BULB
BUSHING
GASKET
FLANGE BUSHING SCREW
ARMORED CAPILLARY TUBING
1" NPT ON 1/2" TO 2" NPT VALVES
1-1/4" NPT ON 2-1/2" TO 4" (65 to 100 mm) VALVES TOP
BULB INSTALLATION
IMPORTANT: Installing the bulb in the correct location
and position is extremely important.
The bulb should be installed at a point of actual system
temperature and it must be fully inserted in the fluid
being controlled.
Tanks - the bulb should be located approximately 2/3
the way up and off to a side of the tube nest. Bulbs
should be above the heating surface and no closer than
4" (100 mm) at any point.
Instantaneous heaters - the bulb should be installed in
the water outlet and as far into the heater as possible.
When a thermometer is used, it should be located PAST
the bulb at least 6 ft. (1.8 m) in the pipeline or on the
same level in the tank.
The bulb can be installed horizontally, vertically or in any
position in between the two, if the flange is uppermost
(see Figure No. 5). When installed horizontally, the word
"TOP" on the flange must be uppermost. See Figure
No. 6.
FOR CONTROLLING LIQUIDS
1. Remove the four (4) bushing screws.
2. Remove the bushing from the thermostatic bulb.
3. Determine the correct pipe size opening (see
Figure No. 6) and insert bushing in tank or
pipeline and tighten securely.
4. Insert bulb and gasket into bushing. Fasten with
the four (4) screws.
FOR CONTROLLING AIR
1. Install bulb on right angles to the air movement
and where an average temperature prevails.
3
Figure No. 5 - Bulb Installation Positions
Figure No. 6 - Bulb Mounting
(Incorrect) (Incorrect)
(Incorrect)